Set the minimum Java version to 11.

Deprecate an enumeration value used for identifying the Java 8 environment.

CONTRIBUTING.md

@@ -158,7 +158,7 @@ For fields that have already been checked against null, use `@RequiresNonNull`.
 or `org.postgresql.util.internal.Nullness.castNonNull(T, String)`.
 
 * You can configure postfix completion in IntelliJ IDEA via `Preferences -> Editor -> General -> Postfix Completion`
-key: `cnn`, applicable element type: `non-primitive`, `org.postgresql.util.internal.Nullness.castNonNull($EXPR$)`.  
+key: `cnn`, applicable element type: `non-primitive`, `org.postgresql.util.internal.Nullness.castNonNull($EXPR$)`.
 
 * The Checker Framework comes with an annotated JDK, however, there might be invalid annotations.
 In that cases, stub files can be placed to `/config/checkerframework` to override the annotations.
@@ -182,7 +182,7 @@ This is explained in the [Java Language Specification](https://docs.oracle.com/j
         @Nullable String[] x;
 
         // array: nullable, elements: nullable
-        @Nullable String @Nullable [] x;  
+        @Nullable String @Nullable [] x;
 
         // arrays: nullable, elements: nullable
         // x: non-nullable
@@ -308,8 +308,8 @@ https://guides.github.com/introduction/flow/.
 Remember to test proposed PgJDBC patches when running against older PostgreSQL
 versions where possible, not just against the PostgreSQL you use yourself.
 
-You also need to test your changes with older JDKs. PgJDBC must support JDK8
-("Java 1.8") and newer.
+You also need to test your changes with older JDKs. PgJDBC must support JDK11
+("Java 11") and newer.
 
 You can get old JDK versions from the [Oracle Java Archive](http://www.oracle.com/technetwork/java/archive-139210.html).
 

build-logic/jvm/src/main/kotlin/build-logic.java.gradle.kts

@@ -72,7 +72,7 @@ tasks.configureEach<Javadoc> {
         addBooleanOption("Xdoclint:all,-missing", true)
         // javadoc: error - The code being documented uses modules but the packages
         // defined in https://docs.oracle.com/javase/9/docs/api/ are in the unnamed module
-        source = "1.8"
+        source = "11"
         docEncoding = "UTF-8"
         charSet = "UTF-8"
         encoding = "UTF-8"

docs/content/development/_index.md

@@ -12,7 +12,7 @@ The PostgreSQL JDBC driver has some unique properties that you should be aware o
 
 The following tools are required to build and test the driver:
 
-* [Java 8 Standard Edition Development Kit](https://java.oracle.com) At least JDK 1.8
+* [Java 8 Standard Edition Development Kit](https://java.oracle.com) At least JDK 11
 * [Gradle](https://gradle.org) At least 7.5
 * [Git SCM](https://git-scm.com)
 * [A PostgreSQL instance](https://www.postgresql.org) to run the tests.

packaging/rpm/postgresql-jdbc.spec.tpl

@@ -58,7 +58,7 @@ Source0:	https://repo1.maven.org/maven2/org/postgresql/postgresql/%{version}/pos
 Provides:	pgjdbc = %version-%release
 
 BuildArch:	noarch
-BuildRequires:	java-devel >= 1.8
+BuildRequires:	java-devel >= 11
 BuildRequires:	maven-local
 BuildRequires:	maven-plugin-bundle
 BuildRequires:	classloader-leak-test-framework

pgjdbc/build.gradle.kts

@@ -172,6 +172,7 @@ val generateGettextSources by tasks.registering {
 }
 
 tasks.compileJava {
+    options.release = 11
     if (enableGettext) {
         dependsOn(generateGettextSources)
     } else {
@@ -248,7 +249,7 @@ val osgiJar by tasks.registering(Bundle::class) {
             Bundle-SymbolicName: org.postgresql.jdbc
             Bundle-Name: PostgreSQL JDBC Driver
             Bundle-Copyright: Copyright (c) 2003-2020, PostgreSQL Global Development Group
-            Require-Capability: osgi.ee;filter:="(&(|(osgi.ee=J2SE)(osgi.ee=JavaSE))(version>=1.8))"
+            Require-Capability: osgi.ee;filter:="(&(|(osgi.ee=J2SE)(osgi.ee=JavaSE))(version>=11))"
             Provide-Capability: osgi.service;effective:=active;objectClass=org.osgi.service.jdbc.DataSourceFactory;osgi.jdbc.driver.class=org.postgresql.Driver;osgi.jdbc.driver.name=PostgreSQL JDBC Driver
             """
         )

pgjdbc/reduced-pom.xml

@@ -27,8 +27,8 @@
     </organization>
 
     <properties>
-        <!-- Require JDK 1.8 or later -->
-        <javac.target>1.8</javac.target>
+        <!-- Require JDK 11 or later -->
+        <javac.target>11</javac.target>
         <encoding>UTF-8</encoding>
         <project.build.sourceEncoding>${encoding}</project.build.sourceEncoding>
         <project.reporting.outputEncoding>${encoding}</project.reporting.outputEncoding>

pgjdbc/src/main/checkstyle/pgjdbc-eclipse-java-google-style.xml

@@ -163,7 +163,7 @@
 <setting id="org.eclipse.jdt.core.formatter.use_tabs_only_for_leading_indentations" value="false"/>
 <setting id="org.eclipse.jdt.core.formatter.alignment_for_selector_in_method_invocation" value="16"/>
 <setting id="org.eclipse.jdt.core.formatter.never_indent_block_comments_on_first_column" value="false"/>
-<setting id="org.eclipse.jdt.core.compiler.source" value="1.8"/>
+<setting id="org.eclipse.jdt.core.compiler.source" value="11"/>
 <setting id="org.eclipse.jdt.core.formatter.insert_space_after_opening_paren_in_synchronized" value="do not insert"/>
 <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_constructor_declaration_throws" value="insert"/>
 <setting id="org.eclipse.jdt.core.formatter.tabulation.size" value="2"/>
@@ -184,7 +184,7 @@
 <setting id="org.eclipse.jdt.core.formatter.alignment_for_superinterfaces_in_enum_declaration" value="16"/>
 <setting id="org.eclipse.jdt.core.formatter.insert_space_before_parenthesized_expression_in_throw" value="insert"/>
 <setting id="org.eclipse.jdt.core.formatter.insert_space_before_colon_in_labeled_statement" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.compiler.codegen.targetPlatform" value="1.8"/>
+<setting id="org.eclipse.jdt.core.compiler.codegen.targetPlatform" value="11"/>
 <setting id="org.eclipse.jdt.core.formatter.brace_position_for_switch" value="end_of_line"/>
 <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_superinterfaces" value="do not insert"/>
 <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_method_declaration_parameters" value="insert"/>
@@ -252,7 +252,7 @@
 <setting id="org.eclipse.jdt.core.formatter.insert_space_before_opening_brace_in_method_declaration" value="insert"/>
 <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_type_parameters" value="insert"/>
 <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_paren_in_catch" value="do not insert"/>
-<setting id="org.eclipse.jdt.core.compiler.compliance" value="1.8"/>
+<setting id="org.eclipse.jdt.core.compiler.compliance" value="11"/>
 <setting id="org.eclipse.jdt.core.formatter.insert_space_before_closing_bracket_in_array_reference" value="do not insert"/>
 <setting id="org.eclipse.jdt.core.formatter.insert_space_after_comma_in_annotation" value="insert"/>
 <setting id="org.eclipse.jdt.core.formatter.insert_space_before_comma_in_enum_constant_arguments" value="do not insert"/>

pgjdbc/src/main/java/org/postgresql/core/JavaVersion.java

@@ -7,7 +7,13 @@
 
 public enum JavaVersion {
   // Note: order is important,
+
+  /**
+   * @deprecated Java 1.8 is not supported anymore.
+   */
+  @Deprecated
   v1_8,
+
   other;
 
   private static final JavaVersion RUNTIME_VERSION = from(System.getProperty("java.version"));
@@ -29,9 +35,6 @@ public static JavaVersion getRuntimeVersion() {
    * @return JavaVersion enum
    */
   public static JavaVersion from(String version) {
-    if (version.startsWith("1.8")) {
-      return v1_8;
-    }
     return other;
   }
 }

pgjdbc/src/test/java/org/postgresql/test/core/JavaVersionTest.java

@@ -7,7 +7,6 @@
 
 import org.postgresql.core.JavaVersion;
 
-import org.junit.Assert;
 import org.junit.Test;
 
 public class JavaVersionTest {
@@ -17,8 +16,5 @@ public void testGetRuntimeVersion() {
     String msg = "java.version = " + currentVersion + ", JavaVersion.getRuntimeVersion() = "
         + JavaVersion.getRuntimeVersion();
     System.out.println(msg);
-    if (currentVersion.startsWith("1.8")) {
-      Assert.assertEquals(msg, JavaVersion.v1_8, JavaVersion.getRuntimeVersion());
-    }
   }
 }

settings.gradle.kts

@@ -17,7 +17,7 @@ pluginManagement {
         id("com.github.vlsi.stage-vote-release") version "1.86"
         id("org.nosphere.gradle.github.actions") version "1.3.2"
         id("me.champeau.jmh") version "0.7.1"
-        kotlin("jvm") version "1.8.21"
+        kotlin("jvm") version "11"
     }
 }